Flat Roof Flashing Details

Roof penetrations can be categorized by whether the roof is sloped or flat.

Flat roof flashing details.

Open valleys have metal flashing to protect this critical area of the roof. That s when the rubber roof gets attached to the flashing with adhesives. Step flashing are for skylights installed on shingle roofs. When a skylight is installed on a flat roof then the flashing around it should be one solid piece.

What typical detailing methods are used to seal flat roof penetrations. Banding is typically used to seal soil vent pipes on single ply roofs such as fdt rhepanol pib and involves wrapping an unreinforced membrane around the pipe to a minimum height of 150mm an approved sealant is then applied to the top of the membrane. While some skylight manufacturers include flashing in their products sometimes roofing professionals have to create it or purchase it separately. Typical methods include banding pitch pockets and cover flashings.

The preferred method of flashing penetrations through flat roofs involves the construction of a curb around the opening. The edge of the roof has thin metal flashing that helps water drip off the roof without damaging the home or causing a leak. In this image step flashing is installed. Small penetrations often do not require curbs.

Cad details document name pdf dwg download all cad construction details 37 1 mb 3 4 mb mc01 identification of roof areas 694 kb 167 kb mc01a single layer underlayment 678 kb 302 kb mc01b double layer underlayment 711 kb 322 kb mc02 vent pipe flashing 626 kb 349 kb mc03 valley.